MLA

Portolano for the Eastern Mediterranean and the Black Sea ("Marston Portolano"). 0AD. https://collections.library.yale.edu/catalog/9998847.

APA, 6th edition

Portolano for the eastern Mediterranean and the Black Sea ("Marston Portolano"). (0 C.E.). [Early works to 1800, Manuscripts, Medieval Italy 15th century, Portolanos Italy 15th century, Portolan charts Italy 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/9998847.